Scamed

I ordered a pair of teddywear through instagram and they told me to pay online payed 200 for the order and pending 300 make after the day then they demanded for 899 and then 1789 fir the gst and other charges and told me that they all charges are refundeble so I payed them and after that my amount was not refunded so I told them to refund they told me you should have to pay 2990 more then they demanded for 2990 for the refund and then your total amount will be refunded so I denied them and told them to cancel my order they told me to pay 699 for the cancellation I also payed that amount but still have not received my amount so pls help me sir/ mam